My ibook has been de-charging itself lately while the charger is plugged in. At school I'm using my ibook on the go all the time so the battery is constantly used. Lately my ibook has been stationary because I'm at home and I really don't need to take it with me. The only reason I'm kind of worried is from the fact my bro's PB had this problem and he needed a whole new logic board. So is it normal for a laptop to de-charge itself? FYI I try to run the battery dry at least once a month.